1、BRITISH STANDARD BS ISO 8334:2007 Forestry machinery Portable chain-saws Determination of balance and maximum holding moment ICS 65.060.80 BS ISO 8334:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2007 BSI 2007 ISBN 978 0 5
2、80 56219 8 National foreword This British Standard is the UK implementation of ISO 8334:2007. It supersedes BS 6916-10:1988 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee AGE/29, Forestry machinery. A list of organizations represented on this committ
3、ee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since public
4、ation Amd. No. Date Comments Reference number ISO 8334:2007(E)INTERNATIONAL STANDARD ISO 8334 Second edition 2007-04-15 Forestry machinery Portable chain- saws Determination of balance and maximum holding moment Matriel forestier Scies chane portatives Dtermination de lquilibre et du moment de suste
5、ntation maximal BS ISO 8334:2007ii iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member bod
6、y interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrote
7、chnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by
8、 the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rig
9、hts. ISO shall not be held responsible for identifying any or all such patent rights. ISO 8334 was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and forestry, Subcommittee SC 17, Manually portable forest machinery. This second edition cancels and replaces the firs
10、t edition (ISO 8334:1985), which has been technically revised to cover not only chain-saws for forest service but those for tree service as well. It includes the additional determination of lateral balance and maximum holding moment. All limits have been removed and are now to be set using the produ
11、ct standards. BS ISO 8334:2007 blank1 Forestry machinery Portable chain-saws Determination of balance and maximum holding moment 1 Scope This International Standards specifies a test method for the longitudinal and the lateral balance of portable combustion engine hand-held chain-saws. It also provi
12、des a test method for determining the maximum holding moment of tree service chain-saws. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition
13、of the referenced document (including any amendments) applies. ISO 6531, Machinery for forestry Portable hand-held chain-saws Vocabulary 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 6531 apply. 4 Determination of balance 4.1 Preparation 4.1.1 Chai
14、n-saw The balance shall be checked on a normal production saw in a new and clean condition. Fuel and oil tanks shall be half full. The saw shall be fitted with a guide bar and an associated saw chain as specified below. The guide bar shall be tightened to its uppermost position. The chain-saw as spe
15、cified in the instruction handbook or according to the manufacturers instructions shall be tested in both of the following two configurations: a) shortest and lightest guide bar, without spiked bumper (if detachable); b) longest and heaviest guide bar, with spiked bumper (if available). The length a
16、nd mass of the guide bars used in the test shall be listed in the test report. 4.1.2 Test equipment The suspension method shall not influence the test result. BS ISO 8334:20072 4.2 Longitudinal balance at front handle of chain-saws for forest service A chain-saw according to 4.1 shall be supported o
17、n the front handle, positioned so that the guide bar plane is vertical. This support shall produce the lowest possible friction to allow saw rotation. See the example shown in Figure 1. Measure and report the angle, , between the centreline of the guide bar and the horizontal plane. Key 1 segment of
18、 a ball bearing Figure 1 Example of device for determining longitudinal balance at front handle for chain-saws for forest service 4.3 Longitudinal balance at rear handle for chain-saws for tree service A chain-saw according to 4.1 shall be supported by a rod of 10 mm diameter, positioned as close as
19、 possible behind the throttle trigger. This rod shall be firmly attached to the rear handle by means of a clamp or similar so that the guide bar plane will be vertical. The rod shall be supported on bearings such that the lowest possible friction is produced. See the example shown in Figure 2. Measu
20、re and report the angle, , between the centreline of the guide bar and the horizontal plane. Figure 2 Example of device for determining longitudinal balance at rear handle for chain-saws for tree service BS ISO 8334:20073 4.4 Lateral balance at rear handle for chain-saws for tree service A chain-saw
21、 shall be balanced on a support pin in accordance with Figure 3. The support pin shall be as close as possible behind the released throttle trigger. The support pin shall be of steel, conical to a maximum of 45 and shall have a contact point with a radii, R, of 1 mm max. If the chain-saw will not re
22、main on the rear handle support pin because of handle design, it is permissible to drill a recess hole for locating the support pin. The recess hole diameter and depth shall be such as to provide positive location of the support pin without interfering with chain-saw movement. Measure and report the
23、 angle, , between the plane of the guide bar and the vertical. Key 1 guide bar centreline 2 support pin 3 rear handle Figure 3 Example of device for determining lateral balance at rear handle for chain-saws for tree service BS ISO 8334:20074 5 Determination of maximum holding moment at rear handle f
24、or chain-saws for tree service Determine the centre of gravity (CG) and the mass, m, of the complete saw, with half-full tanks and the longest guide bar with a saw chain and spiked bumper (if available). The guide bar shall be tightened to its uppermost position. Measure the distance, R, from the re
25、ference point (RP) to the centre of gravity. RP is located as close as possible behind the back of the released throttle trigger as shown in Figure 4, and is defined as the point at which the inside of the rear handle intersects the back of the released throttle trigger. The measurement shall be con
26、ducted from RP in a plane parallel to the guide bar plane to the axis through the centre of gravity perpendicular to the guide bar plane. Calculate the holding moment, M H , in Newton metres (N m), using the formula: 3 H 10 MmgR = where m is the chain-saw mass (kg); g is the acceleration due to grav
27、ity, i.e. 9,81 m/s 2 ; R is the distance between the reference point and the centre of gravity (mm). Key M Hholding moment R distance between RP and CG m mass of chain-saw 1 reference point (RP) 2 centre of gravity (CG) Figure 4 Determination of maximum holding moment at rear handle for chain-saws f
28、or tree service BS ISO 8334:20075 6 Test report The test report shall include at least the following information: a) reference to this International Standard (i.e. ISO 8334); b) date and place of measurement; c) description of the chain-saw, including manufacturer, type, model and serial number, typ
29、e and length of guide bars and saw chains, and mass of the chain-saw (with guide bar and saw chain, and with tanks half full), in kilograms; d) description of the measuring equipment; e) recorded values of longitudinal balance at front handle for chain-saws for forest service, or longitudinal balanc
30、e and lateral balance at rear handle, for chain-saws for tree service, and maximum holding moment at the rear handle for chain-saws for tree service; f) name of test station and person responsible for the test. An example of a test report is given in Annex A. BS ISO 8334:20076 Annex A (informative)
31、Example test report Test report for ISO 8334, Forestry machinery Portable chain-saws Determination of balance and maximum holding moment Chain-saw manufacturer: Chain-saw type and model: Chain-saw serial number: Date and place of measurement: Name of test station and person responsible for test: Lon
32、gitudinal balance Chain-saw for forest service Yes Chain-saw for tree service Yes Tank half filled (cm 3 ) Guide bar length (cm)/mass (kg) Spiked bumper Saw chain type Total chain-saw mass (kg) Shortest: ./. Yes No Longest: ./. Yes No Measured longitudinal guide bar angle from the vertical, or Short
33、est bar length Angle () Longest bar length Angle () Lateral balance for tree service chain-saws Tank half filled (cm 3 ) Guide bar length (cm)/mass (kg) Spiked bumper Saw chain type Total chain-saw mass (kg) Shortest: ./. Yes No Longest: ./. Yes No Measured lateral guide bar angle from the vertical,
34、 Shortest bar length Angle() Longest bar length Angle() Holding moment for tree service chain-saws Tank half filled Longest guide bar length Saw chain Spiked bumper cm 3 cm Ty p e Ty p e Y e s No R distance between reference point (RP) and centre of gravity (CG) (mm) m total chain-saw mass (kg) Calc
35、ulated holding moment, 3 H 9,81 10 M mR = (N m) BS ISO 8334:2007 blankBS ISO 8334:2007 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at th
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